Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 209212: When Mr. Reader packed his books into bundles of 12 books there were 2 books left unpacked. When he repacked his books in bundles of 9, there were 2 books left again. Finally, when Mr Reader packed his books in bundles of 7, there were no books left unpacked. Find the smallest number of books that Mr. Reader could have.
Click here to see answer by ankor@dixie-net.com(15645)

Question 209458: 6x+7y=32
x=20-3y
Click here to see answer by rfer(12654)

Question 208972: Aneku has 21 coins whose total value is Sh. 72, there are twice as many five shillings coins as there are 10 shilling coins. The rest are one shilling coins. Find the number of ten shilling coins that Aneku has
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Question 208971: Given that 29a031 x 342 = 100900b02 where a and b denote two missing interger, find the value of a+b
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Question 209719: I need your help figuring out how to solve 4x+3y=4 and 6x-6y=-1 by elimination.
Click here to see answer by stanbon(57282)

Question 209759: slope this line 3y =24 - 9x
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Question 209718: I need your help figuring out how to solve 4x+3y=4 and 6x-6y=-1 by elimination.
Click here to see answer by jim_thompson5910(28536)

Question 209868: how do I eliminate variables using the addition method?
2x-y+z=1
3x-3y+4z=5
4x-2y+3z=4
Click here to see answer by ankor@dixie-net.com(15645)

Question 210001: Substitute, eliminate or graph
y= 2/5 x-7
y=2/5 x+4

Click here to see answer by Earlsdon(6287)

Question 210102: 2x-3y+2z=-1
x+2y=-5
2x-y+7z=-8
the answer says that it should be 6,1,7 but i can't figure out how they got those answers. Please Help!
Click here to see answer by jim_thompson5910(28536)

Question 210154: HOW TO SOLVE THIS PROBLEM: 21-(-7)divided by 7
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Question 210161: how many solutions does a consistent and dependent system of linear equations have?
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Question 210301: Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function.
f(x) = 2x^2 + 2
Do I need to rearrange the problem putting x to zero? 2x^2 + 2= 0
Click here to see answer by stanbon(57282)

Question 210116: I am confused on how to solve this, every time I do I get x=4, but it does not check out. What am I doing wrong?
Click here to see answer by Alan3354(30993)

Question 210193: solve the systems of equations
5x+4y=6
-2x-3y=-1
Click here to see answer by jim_thompson5910(28536)

Question 210349: hello tutors, by the i'd like to ask a question about problem solving. 'cause i have no idea of this problem can you help me to solve this problem. the problem is this...
a mother is 36 years old and her daughter is 14 years old. in how many years will the mother be twice as old as the daughter?
thanks you guy's!.. hope you can help me with my homework.
Click here to see answer by ankor@dixie-net.com(15645)

Question 210135: Wilma drove at an average speed of mi/h from her home in City A to visit her sister in City B. She stayed in City B hours, and on the trip back averaged mi/h. She returned home hours after leaving. How many miles is City A from City B
Click here to see answer by ankor@dixie-net.com(15645)

Question 210517: please help me !! I am trying to help my son with an algebra word problem and I do not remember how to do this type of algebraic equation. I do remember: Time = Distance divided by Rate . We have filled in the variables but that is as far as we got. Thanks, here is the question.....
Fastball thrown by.....travels at a speed of 145km/hr toward the batter who is 18.3 meters away. How long does it take the baseball to travel this distance.
Distance divided by Rate = Time
18.3m 145km/hr = t
Click here to see answer by checkley77(12569)

Question 210757: Decide whether the pair of lines are parallel,perpendicular, or neither
3x+5y=8
5x-3y=5
Click here to see answer by tutor_paul(490)

Question 210758: find the domain of the function
g(x)=2/7-3x
Click here to see answer by stanbon(57282)

Question 210760: find the slope
(2,10) and (7,-15)
Click here to see answer by Earlsdon(6287)

Question 210755: graph the equation using the slope and y-intercept
y=9/5x=6
Click here to see answer by Alan3354(30993)

Question 210759: graph on a number line, where x is a real number
-4
Click here to see answer by nyc_function(2733)

Question 137979: How do you solve this system?
x + 2y-3z = -8
2x + y + 3z= 17
x - 3y + 3z = 11
Click here to see answer by AndrewRyan(3)

Question 210944: solve for indicated letter
b=3c,for c
Click here to see answer by DRichardson(63)

Question 210946: Solv for the indicated letter
b=3c, for c
The solution is c=_____
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Question 210946: Solv for the indicated letter
b=3c, for c
The solution is c=_____
Click here to see answer by stanbon(57282)

Question 210945: In 1992 the life expectancy of males in a certain country was 69.4, it was 72.9 years. Let E repersent the life expectancy in year t and let t repersent the number of years since 1992
The linear function E(t) that fits the data is
E(t)=_____t+____
Use the function to predict the life expectancy of males in 2003.
E(11)=______
Click here to see answer by stanbon(57282)

Question 210911: v=9t+300
v=7t+400
Click here to see answer by checkley77(12569)

Question 210754: 1992 the life expectancy of males in a certain county was 69.4 years, in 1998 it was 72.9 years, let E repersent the life expectancy in year, and t repersent the number of years since 1992.
E(T)=___t+____
E(11)=_______
Click here to see answer by RAY100(1637)

Question 210909: 7x+2y=-8
8y=4x
Click here to see answer by edjones(7569)

Question 211088: This problem in extra work but i am confused. If anyone can help thanks.
Solve algebraically, using the five step method. Show all steps.
The width of a poool is 3/4 of its length. It takes 126 feet of fence to edge the pool What are the dimensions of the pool?
Click here to see answer by stanbon(57282)

Question 211087: This problem in extra work but i am confused. If anyone can help thanks.
Solve algebraically, using the five step method. Show all steps.
The area of a rectangle in 525cm^2 Find the dimensions of a rectangle if the ratio of the length to the width is 7:3
Click here to see answer by ankor@dixie-net.com(15645)

Question 211176: a bakery makes a special whole-grain bread using two kinds of flour. whole wheat and rye. the recipe for this bread calls for 1 oz rye flour for every 4 oz of whole-wheat flour. how many ounces of each kind of flour should be used to make a loaf of bread weighing 32 oz?
Click here to see answer by stanbon(57282)

Question 211181: the taco contained 1kg of onion for every 6.6kg of grilled steak. the total weight of these two ingredients was 617.6kg. to the nearst tenth of a kilogram, how many kilograms of onions and how many kilograms of grilled beef were used to make the taco?
Click here to see answer by rfer(12654)

Question 210963: Solve the linear system: 2x + 7y = 41, 2y = 3x + 1
Click here to see answer by ankor@dixie-net.com(15645)

Question 211290: -4x-15=57
5x+2y=11
How do you solve systems equations?
Click here to see answer by Alan3354(30993)

Question 211329: Three years ago, Jeff was twice as old as Mike is now. In nine years, Jeff will be four years older than Mike is now. What are their current ages?

Click here to see answer by stanbon(57282)

Question 211392: if a teller has 54 $5.00 and $20.00 bills in her drawer that total $780.00. How many of the bills are $5.00?
Click here to see answer by rapaljer(4667)

Question 211486: Need to find he values of x and y that solves the system equation
-4x + 5y = -10
5x - 4y = 8
Click here to see answer by jim_thompson5910(28536)

Question 211713: Write in standard form. Identify A,B, and C.
4x=8y-12
Click here to see answer by HyperBrain(694)

Question 211743: the present age of a father is three years more than three times the age of his son. three year hence,fathers age will be 10 years more than twice the age of his son. determine their present ages.
Click here to see answer by ankor@dixie-net.com(15645)

Question 211834: 2x^2+27x+56=0 please help factor
Click here to see answer by jim_thompson5910(28536)

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